What's the exact issue? That equation works fine for moving around an origin sinusoidally.
Desmos | Graphing Calculator
o = origin, a = amplitude, f = frequency, t = time.
Is your question on the time? For that you'd just track the change in time between update calls and add that to your time...
+Vouch
Purchased two 6 digits.
One had an issue, but he was quick to return the payment for that account, the other arrived as stated without any issue.
Seller is quick, is quick to reply, and is a pleasure to transact with.
User Reals (direct link) offered the service of selling Steamworks developer badges (direct link to thread).
After sending the keys and required information I waited the 48 hours to receive the badge, never did. I also looked as his profile and he himself no-longer has the badge. Either it...
He is no longer responding to my messages, so I'm out $6. He has not provided the accounts.
EDIT:
One of the accounts now works, I'm going to test the others.
EDIT #2:
The other two accounts still don't work.
This is a report on the following Sythe user
http://www.sythe.org/members/474128-stormed.html
He agreed to sell me some old steam accounts for $2 each over Steam. I was curious so I PM'ed him on Sythe to verify that it was the same person, and it was.
I had him log into one of the old...